Speaker or Sound Problem?

Well heres my story, i got this Realtek HD Audo Manager, and in it you can mess with the pitch of the singer/instruments how loud it is and all that. but well today i ended up messing around with it and messing their pitch a lot. And well in laymans terms it ''broke'' so i was wondering if anyone can help?

I went to master volume checked the volume, and learned that they both work, but only one at a time (If i set everything to right speaker then that one works like before, vice versa)
Edit: I plugged in some head phones, and it still sounds kind of well blurry.